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Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`. Use `clang-format` version 15.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Fixes: #24315
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8d4a9ee398 Refactoring: rename "cm_static_string_view.hxx" as <cmext/string_view>
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4689
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Newer IWYU is not seeing this as necessary for `_GLIBCXX_USE_CXX11_ABI`.
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Run the `clang-format.bash` script to update our C and C++ code to a new
include order `.clang-format`. Use `clang-format` version 6.0.
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Provide a standardized way to handle the C++ "standard" headers
customized to be used with current CMake C++ standard constraints.
Offer under directory `cm` headers which can be used as direct
replacements of the standard ones. For example:
#include <cm/string_view>
can be used safely for CMake development in place of the `<string_view>`
standard header.
Fixes: #19491
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The IWYU tool we use for CI now diagnoses these.
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Suppress one in code generated by flex.
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The `str()` method must be non-const because it may need to internally
mutate the representation of the string in order to have an owned
`std::string` instance holding the exact string (not a superstring).
This is inconvenient in contexts where we can ensure that no mutation
is needed to get a `std::string const&`.
Add a `str_if_stable() const` method that returns `std::string const*`
so we can return `nullptr` if if mutation would be necessary to get a
`std::string const&`. Add supporting `is_stable() const` and
`stabilize()` methods to check and enforce stable availability of
`std::string const&`. These can be used to create `String const`
instances from which we can still get a `std::string const&` via
`*str_if_stable()` by maintaining the stability invariant at runtime.
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Create a `static_string_view` type that binds only to the static storage
of string literals. Teach `cm::String` to borrow from these implicitly.
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This will allow creation of `cm::String` instances that borrow from
non-owned storage. It is the caller's responsibility to ensure that
no copy of the instance outlives the borrowed buffer.
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Use expression templates to collect the entire expression and
pre-allocate a string with the final length before concatenating
the pieces.
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Create a `cm::String` type that holds a view of a string buffer and
optionally shares ownership of the buffer. Instances can either
borrow longer-lived storage (e.g. static storage of string literals)
or internally own a `std::string` instance. In the latter case,
share ownership with copies and substrings. Allocate a new internal
string only on operations that require mutation.
This will allow us to recover string sharing semantics that we
used to get from C++98 std::string copy-on-write implementations.
Such implementations are not allowed by C++11 so code our own in
a custom string type instead.
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